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Finding the Fourth Proportional to 81,178.80, 121,710.60 and 31,239.60

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Solution

The fourth proportional to 81,178.80, 121,710.60 and 31,239.60 is: 46,837.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,178.80 : 121,710.60 = 31,239.60 : x
  2. Step 2: Convert to fraction form
    81,178.80/121,710.60 = 31,239.60/x
  3. Step 3: Cross multiply
    81,178.80x = 121,710.60 × 31,239.60
  4. Step 4: Simplify right side
    81,178.80x = 3,802,190,459.76
  5. Step 5: Solve for x
    x = 3,802,190,459.76/81,178.80
  6. Step 6: Final answer
    x = 46,837.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.